Improvement in mainspring-barrel attachment for watches



0; L. ELIASON. Mainspring Barrel Attachment for Watches. No. 102,517. Patented May 3, 1870.

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OLA L. ELIASON, OF SALT LAKE CITY, UTAH TERRITORY.

Letters Patent No. 102,517, dated May 3, 1870.

IMPROVEMENT IN MAINSPRING-BARREL ATTACHMENT FOR WATCHES.

The Schedule referred to in these LetternPatent and. making part of the same I, OLA L. ELIAsos, of Salt Lake City, in the county of Salt Lake and Territory of Utah, have invented certain Improvements in Safety Mainspring Barrels for Watches, of which the following is a specification.

My invention relates to an improved construction of the several parts of the motion of a watch. Thus, the pinion 0r first driving-wheel transfers the forward motion, caused bythe spring when wound up, but it does not in the least degree partake of the backlash, caused by the accidental breaking of the mainspring.

To prevent this backlash is to prevent considerable damage to the different parts of the train in a watch, and my method of connecting the wheel to the main-- spring-barrel, by aid of ratchet-wheel and pawls, transferring only the forward motion, serves this purpose in the most perfect manner.

Description of the Accompanying Drawings. Figure 1 is a bottom view of my improved safety mainspring barrel.

Figure 2 is a vertical central section of the same.

Figure -'3 is a vertical central section of. the wheel, detached fromthe mainspring barrel.

General Description. A represents the barrel which incloses the mainspring.

a is the lid which closes the mainspring barrel in the usual way.

B represents the wheel, which is a toothed ring,,

constructed with two annular steps, I) b.

One of these steps, b, is made to fit the lower end of the barrel A, and the other step, b, forms a receptacle for a ratchet-wheel, O, which is fastened by two screws, 0 c, to the bottom of the barrel A, for which purpose the said bottom is provided'with a step, c to make it flush with the step If, on the wheel B.

Thus'the hearing or annular wearing part b of the wheel B is enclosed between the bottom of the barrel and the overlapping ratchet-wheel.

The arbor D is of usual construction, as also the two stopping-wheels, E and E.

'The square shank (1 serves the purpose of winding up.

The lower square shank has the stopping-wheel E fitted to it, and below the ratchet -wheel 0 there should be another ratchet-wheel on the arbor, to receive and sustain the back pressure ofthe mainspring upon the arbor.

I have .omitted this, as I have also omitted the inainsprin They are of common constructiomaml I do not deem their presence necessary.

The wheel B is also provided with two pawls, F F, and two pawl-springs, f f.

It is plainly seen that the wheel B is, through said iatche-t-wheel and pawls, compelledto go with the barrel in its't'orward motion, and drive the different parts of the train in the usual way; but should the spring accidentally break, and the sudden and forcible recoil of it cause a reverse movement of the barrel, thepawls FF would slide over the teeth of the ratchet without effecting the slightest jerk upon the wheel B, thereby preventing considerabledamage to the train.

I would furthermore call attention to some very important merits of my invention.

The lower recess 1) of the wheel B. forms a hearing against the overlapping ratcl'iet-wheei, and the upper recess 11 of the same wheel forms the bearing against the bottom of the barrel A.

In this manner the smallannular flange between the two recesses b and b furnishes the only bearing surface for horizontal bearing, while the vertical hearing is received by the cylindrical surface of the recess b, and the part of the spring-barrel titted into it.

I can fit my wheel to any spring-bane], and place it in the. exact position of the old wheel, without materially changing the old spring-barrel.

l have'also provided my wheel with two pawls, instead of one, because I thereby relieve it from a onesided pressure, which would cause thewhcel and barrel to jam, if, after long service, the fitted bearing should become loose. Such jam would eventually prevent the successful working'ot my invention.

I make my pawls short and stout, and use. separate springs to actuate them.

This arrangen'ient takes less room than a springpawl in one piece, which has to be'strong and stout, to prevent bending or breaking, and long enough to endow it with the necessary elasticity.

It is hereby shown that my invention combines great simplicity of construction, great strength, accessibility, and liability inivery small compass, and thercfore great security.

The ease of its adaptation to old watches, as well as the cheapness of its construction, areso obvious to any man of the profession, thatIdeem it unnecessary to comment upon them.

Claim.

I claim as my invention- The combinationand arrangement of the spring barrel A, the annular wheel B, with its annular bear-' lug-flange, between the recesses o and 1), its horizontal and vertical bearings, the overlapping ratchetwheel 0, and pawls F F, with springs ff, arranged and constructed as and for the purpose set forth.

, O. L..ELIASON. Witnesses:

SAML. KAnlv, S. S. WALKER... 

